Details
| Original language | English |
|---|---|
| Pages (from-to) | 11974-11980 |
| Number of pages | 7 |
| Journal | Physical Chemistry Chemical Physics |
| Volume | 14 |
| Issue number | 34 |
| Publication status | Published - 14 Sept 2012 |
Abstract
A thorough understanding of ion dynamics in solids, which is a vital topic in modern materials and energy research, requires the investigation of diffusion properties on a preferably large dynamic range by complementary techniques. Here, a polycrystalline sample of Li 2TiO 3 was used as a model substance to study Li motion by both 7Li spin-alignment echo (SAE) nuclear magnetic resonance (NMR) and ac-conductivity measurements. Although the two methods do probe Li dynamics in quite different ways, good agreement was found so that the Li diffusion parameters, such as jump rates and the activation energy, could be precisely determined over a dynamic range of approximately eleven decades. For example, Li solid-state diffusion coefficients D σ deduced from impedance spectroscopy range from 10 -23 m 2 s -1 to 10 -12 m 2 s -1 (240-835 K). These values are in perfect agreement with the coefficients D SAE deduced from SAE NMR spectroscopy. As an example, D SAE = 2 × 10 -17 m 2 s -1 at 433 K and the corresponding activation energy determined by NMR amounts to 0.77(2) eV (400-600 K). At room temperature D σ takes a value of 3 × 10 -21 m 2 s -1. This journal is
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In: Physical Chemistry Chemical Physics, Vol. 14, No. 34, 14.09.2012, p. 11974-11980.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Extremely slow Li ion dynamics in monoclinic Li 2TiO 3 - Probing macroscopic jump diffusion via 7Li NMR stimulated echoes
AU - Ruprecht, Benjamin
AU - Wilkening, Martin
AU - Uecker, Reinhard
AU - Heitjans, Paul
PY - 2012/9/14
Y1 - 2012/9/14
N2 - A thorough understanding of ion dynamics in solids, which is a vital topic in modern materials and energy research, requires the investigation of diffusion properties on a preferably large dynamic range by complementary techniques. Here, a polycrystalline sample of Li 2TiO 3 was used as a model substance to study Li motion by both 7Li spin-alignment echo (SAE) nuclear magnetic resonance (NMR) and ac-conductivity measurements. Although the two methods do probe Li dynamics in quite different ways, good agreement was found so that the Li diffusion parameters, such as jump rates and the activation energy, could be precisely determined over a dynamic range of approximately eleven decades. For example, Li solid-state diffusion coefficients D σ deduced from impedance spectroscopy range from 10 -23 m 2 s -1 to 10 -12 m 2 s -1 (240-835 K). These values are in perfect agreement with the coefficients D SAE deduced from SAE NMR spectroscopy. As an example, D SAE = 2 × 10 -17 m 2 s -1 at 433 K and the corresponding activation energy determined by NMR amounts to 0.77(2) eV (400-600 K). At room temperature D σ takes a value of 3 × 10 -21 m 2 s -1. This journal is
AB - A thorough understanding of ion dynamics in solids, which is a vital topic in modern materials and energy research, requires the investigation of diffusion properties on a preferably large dynamic range by complementary techniques. Here, a polycrystalline sample of Li 2TiO 3 was used as a model substance to study Li motion by both 7Li spin-alignment echo (SAE) nuclear magnetic resonance (NMR) and ac-conductivity measurements. Although the two methods do probe Li dynamics in quite different ways, good agreement was found so that the Li diffusion parameters, such as jump rates and the activation energy, could be precisely determined over a dynamic range of approximately eleven decades. For example, Li solid-state diffusion coefficients D σ deduced from impedance spectroscopy range from 10 -23 m 2 s -1 to 10 -12 m 2 s -1 (240-835 K). These values are in perfect agreement with the coefficients D SAE deduced from SAE NMR spectroscopy. As an example, D SAE = 2 × 10 -17 m 2 s -1 at 433 K and the corresponding activation energy determined by NMR amounts to 0.77(2) eV (400-600 K). At room temperature D σ takes a value of 3 × 10 -21 m 2 s -1. This journal is
UR - http://www.scopus.com/inward/record.url?scp=84865142682&partnerID=8YFLogxK
U2 - 10.1039/c2cp41662j
DO - 10.1039/c2cp41662j
M3 - Article
AN - SCOPUS:84865142682
VL - 14
SP - 11974
EP - 11980
JO - Physical Chemistry Chemical Physics
JF - Physical Chemistry Chemical Physics
SN - 1463-9076
IS - 34
ER -